Note: the second dimension of the array A
must be at least
max1,minM+KU,N.

On entry: the band matrix to be printed.

The matrix is stored in rows 1 to kl+ku+1, more precisely, the element Aij must be stored in

Aku+1+i-jj for ​max1,j-ku≤i≤minm,j+kl.

6: LDA – INTEGERInput

On entry: the first dimension of the array A as declared in the (sub)program from which X04CFF is called.

Constraint:
LDA≥KL+KU+1.

7: FORM – CHARACTER(*)Input

On entry: describes the Fortran format code for printing the elements of the matrix A. The format code may be any allowed on the system, whether it is standard Fortran or not. It may or may not be enclosed in brackets.

In addition, there are the following special codes which force X04CFF to choose its own format code:

FORM=' '

X04CFF will choose a format code such that numbers will be printed with an F8.4, an F11.4 or a 1PE13.4 format. The F8.4 code is chosen if the sizes of all the matrix elements to be printed lie between 0.001 and 1.0. The F11.4 code is chosen if the sizes of all the matrix elements to be printed lie between 0.001 and 9999.9999. Otherwise the 1PE13.4 code is chosen.

FORM='*'

X04CFF will choose a format code such that numbers will be printed to as many significant digits as are necessary to distinguish between neighbouring machine numbers. Thus any two numbers that are stored with different internal representations should look different on output. Whether they do in fact look different will depend on the run-time library of the Fortran compiler in use.

By preceding the desired format code by the string ‘MATLAB’, X04CFF will print the matrix such that it can be input into MATLAB, and TITLE will be used as the name of the matrix.

Examples of valid values for FORM are 'F11.4', '1PE13.5', 'G14.5', 'MATLABF11.4', 'MATLAB*'.

Constraint:
the character length of the format specifier in FORM must be ≤80.

8: TITLE – CHARACTER(*)Input

On entry: a title to be printed above the matrix, or name of the matrix.

If TITLE=' ', no title (and no blank line) will be printed.

If TITLE contains more than NCOLS characters, the contents of TITLE will be wrapped onto more than one line, with the break after NCOLS characters.

Note: the dimension of the array CLABS
must be at least
N if LABCOL='C', and at least 1 otherwise.

On entry: if LABCOL='C', CLABS must contain labels for the columns of the matrix, except in MATLAB mode where CLABS is ignored.

Labels are right-justified when output. Any label that is too long for the column width, which is determined by FORM, is truncated.

13: NCOLS – INTEGERInput

On entry: the maximum output record length. If the number of columns of the matrix is too large to be accommodated in NCOLS characters, the matrix will be printed in parts, containing the largest possible number of matrix columns, and each part separated by a blank line.

NCOLS must be large enough to hold at least one column of the matrix using the format specifier in FORM. If a value less than 0 or greater than 132 is supplied for NCOLS, then the value 80 is used instead.

14: INDENT – INTEGERInput

On entry: the number of columns by which the matrix (and any title and labels) should be indented. The effective value of NCOLS is reduced by INDENT columns. If a value less than 0 or greater than NCOLS is supplied for INDENT, the value 0 is used instead.

15: IFAIL – INTEGERInput/Output

On entry: IFAIL must be set to 0, -1​ or ​1. If you are unfamiliar with this parameter you should refer to Section 3.3 in the Essential Introduction for details.

For environments where it might be inappropriate to halt program execution when an error is detected, the value -1​ or ​1 is recommended. If the output of error messages is undesirable, then the value 1 is recommended. Otherwise, if you are not familiar with this parameter, the recommended value is 0. When the value -1​ or ​1 is used it is essential to test the value of IFAIL on exit.

On exit: IFAIL=0 unless the routine detects an error or a warning has been flagged (see Section 6).

6 Error Indicators and Warnings

If on entry IFAIL=0 or -1, explanatory error messages are output on the current error message unit (as defined by X04AAF).